We've heard exchange getting hacked and millions of dollar worth crypto being stolen.
Last year, Myetherwallet was exposed and hacker penetrated and stole alot.
Scam ICO made away with millions in recent years.
Crypto traders and investors are taking precautions so as to not fall victim. This doesn't guarantee Scam free Crypto space coz right now someone is being scam.
What could be the biggest Crime in cryptocurrency
I think the biggest crimes in cryptocurrencies are centralized cryptocurrencies exchanges. They tend to pose potential risks for traders and those that entrust their funds with them. A lot of things can happen that can compromise these exchanges and make users lose their funds. Too much trust is centralized. This alone defies the sole essence of the blockchain technology which is to eliminate TRUST.